I just replaced the starter in my 68', twice . The first time there must have been a crossed wire or a bare spot on the positive cable. The truck backfired, lost power , died and smoke poured out from under the passenger side fender. I popped the hood and the positive battery cable had melted.

I thought for sure I fried the starter, turns out the positive cable was the only casualty. Reconnected everything tried to start it up and nothing. Re-checked connections still nothing. Also no lights, parking, headlights or brake. broke out the test light:

Battery is good
Power from starter good
Power to the coil
Power at alternator
Power at fuse block
Power to ignition switch

This is old news now, turns out the battery was not as good as I thought. It was actually dead. It had enough juice to barely get any power to the headlights so I assumed it was good. Volt meter proved me wrong and it wouldn't hold a charge.

Once that was resolved I noticed that the truck suddenly had gotten very loud.

Here's why !

Blew one right open and distorted the other. These are the mufflers that LMC includes with there stock replacement exhaust system, and only about 4-5 months old.

and here was my solution !

Truck sounds so much better with Summit "Flow Masters".

The what did you do to your truck today thread was locked so I posted here !